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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f5c550fe917b5e1a40ba5745f2e6ce074103efefe743fa01bc3bfc2654854f2' 
  AND token = 'nsSa4hmipTFXBK0QF2NxM08KHfkL5uj/NUO0qWGblQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}